/*******************************************************************************
 * Copyright (c) 2008 LuaJ. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 ******************************************************************************/
package com.org.luaj.script;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import java.util.Arrays;
import java.util.List;

/**
 * Jsr 223 scripting engine factory
 */
public class LuaScriptEngineFactory implements ScriptEngineFactory {

    private static final String[] EXTENSIONS = {
            "lua",
            ".lua",
    };

    private static final String[] MIMETYPES = {
            "text/plain",
            "text/lua",
            "application/lua"
    };

    private static final String[] NAMES = {
            "lua",
            "luaj",
    };

    private static final ThreadLocal<ScriptEngine> engines = new ThreadLocal<ScriptEngine>();
    private List extensions;
    private List mimeTypes;
    private List names;


    public LuaScriptEngineFactory() {
        extensions = Arrays.asList(EXTENSIONS);
        mimeTypes = Arrays.asList(MIMETYPES);
        names = Arrays.asList(NAMES);
    }

    public String getEngineName() {
        return getScriptEngine().get(ScriptEngine.ENGINE).toString();
    }

    public String getEngineVersion() {
        return getScriptEngine().get(ScriptEngine.ENGINE_VERSION).toString();
    }

    public List getExtensions() {
        return extensions;
    }

    public List getMimeTypes() {
        return mimeTypes;
    }

    public List getNames() {
        return names;
    }

    public String getLanguageName() {
        return getScriptEngine().get(ScriptEngine.LANGUAGE).toString();
    }

    public String getLanguageVersion() {
        return getScriptEngine().get(ScriptEngine.LANGUAGE_VERSION).toString();
    }

    public Object getParameter(String key) {
        return getScriptEngine().get(key).toString();
    }

    public String getMethodCallSyntax(String obj, String m, String... args) {
        StringBuffer sb = new StringBuffer();
        sb.append(obj + ":" + m + "(");
        int len = args.length;
        for (int i = 0; i < len; i++) {
            if (i > 0) {
                sb.append(',');
            }
            sb.append(args[i]);
        }
        sb.append(")");
        return sb.toString();
    }

    public String getOutputStatement(String toDisplay) {
        return "print(" + toDisplay + ")";
    }

    public String getProgram(String... statements) {
        StringBuffer sb = new StringBuffer();
        int len = statements.length;
        for (int i = 0; i < len; i++) {
            if (i > 0) {
                sb.append('\n');
            }
            sb.append(statements[i]);
        }
        return sb.toString();
    }

    public ScriptEngine getScriptEngine() {
        ScriptEngine eng = engines.get();
        if (eng == null) {
            eng = new LuaScriptEngine();
            engines.set(eng);
        }
        return eng;
    }
}
